Clinical trials have been carried out over the past 12 months on 1,000 men and women, who were asked to wash their hair with the shampoo and conditioner daily.

They had their hair dyed, photographed and measured for growth every six weeks.

After the first six weeks, the hair of half the subjects tested showed increased growth – on average 17 per cent more than normal.

However, after another six weeks’ use of Fast all the men and women’s hair had increased growth. On average, after 12 weeks, hair grew 30 per cent faster than usual, although one subject experienced a 99 per cent boost in hair length.

The shampoo and conditioner will cost £24.99 together when they go on sale in Boots.

A Fast spokesman said: ‘We’ve worked hard to find a hair growth solution which is accessible to everyone, including chemotherapy patients.’

Breast cancer sufferer Shirley Huggett, 56, of Tenterden, Kent, tried the shampoo after losing her hair following a course of chemotherapy.

‘My hair started growing again, but I was embarrassed to go out because it was so short,’ she said. ‘I was given a sample of Fast and my hair growth has been unbelievable.

it claims that in order for you to see results youd have to use both products daily. youd probably be better of shampooing/condition and massaging more often with your regular products and see if you get results than shelling out $80 on this.

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